The American nation is formed, for the most part, from migrants, as well as from the things they brought (this includes slaves who were legally considered property, moreover, in the form of a thing). Now the main evidence that African-Americans are part of the American nation is that almost 15% of the country’s population are African-Americans.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.